<template>
 <div class="list" ref="wrapper">
  <div>
   <div class="area">
   <div class="title border-topbottom">当前城市</div>
   <div class="button-list">
    <div class="button-wrapper">
     <div class="button nowcity">{{this.city}}</div>
    </div>
   </div>
   </div>
   <div class="area">
   <div class="title border-topbottom">热门城市</div>
   <div class="button-list">
    <div class="button-wrapper" v-for="item of hot" :key="item.id" @click="handleChangCity(item.name)">
     <div class="button">{{item.name}}</div>
    </div>
   </div>
   </div>
   <div class="area" v-for="(item,key) of cities" :key="key" :ref="key">
   <div class="title border-topbottom">{{key}}</div>
   <div class="item-list">
    <div class="item border-bottom" v-for="innerItem of item" :key="innerItem.id" @click="handleChangCity(innerItem.name)">{{innerItem.name}}</div>
   </div>
   </div>
  </div>
 </div>
</template>
<script>
import Bscroll from 'better-scroll'
import { mapState, mapMutations } from 'vuex'
export default {
  name: 'CityList',
  props: {
    cities: Object,
    hot: Array,
    letter: String
  },
  data () {
    return {
      timer: null
    }
  },
  computed: {
    ...mapState(['city'])
  },
  methods: {
    handleChangCity (city) {
      this.changeCity(city)
      this.$router.push('/')
    },
    ...mapMutations(['changeCity'])
  },
  updated () {
    this.scroll = new Bscroll(this.$refs.wrapper)
    // this.$nextTick(() => {
    //   this.scroll = new Bscroll(this.$refs.wrapper)
    // })
  },
  watch: {
    letter () {
      if (this.letter) {
        const element = this.$refs[this.letter][0]
        this.scroll.scrollToElement(element)
      }
    }
  }
}
</script>
<style lang="stylus" scoped>
 @import '~styles/varibles.styl'
 .border-topbottom
   &:before
     border-color #ccc
   &:after
     border-color #ccc
 .border-bottom
   &:before
     border-color #ccc
 .list
   overflow hidden
   position absolute
   top 1.58rem
   left 0
   bottom 0
   right 0
   .nowcity
     background-color $bgColor
   .title
     line-height .54rem
     background-color #eee
     padding-left .2rem
     color #666
     font-size .26rem
   .button-list
     overflow hidden
     padding .1rem .6rem .1rem .1rem
     .button-wrapper
       float left
       width 33.33%
       .button
         text-align center
         padding .1rem 0
         margin .1rem
         border .02rem solid #ccc
         border-radius .06rem
   .item-list
     .item
       line-height .76rem
       padding-left .2rem
</style>
